linux-kernel - [PATCH] x86: do_boot_cpu - check for ESR apic register presence before touching

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Message-ID: <20080915150518.GA23798@lenovo>
Date:	Mon, 15 Sep 2008 19:05:18 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Ingo Molnar <mingo@...e.hu>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Yinghai Lu <yhlu.kernel@...il.com>
Subject: [PATCH] x86: do_boot_cpu - check for ESR apic register presence
	before touching

We should check first if there is ESR register before read/write it.

Signed-off-by: Cyrill Gorcunov <gorcunov@...il.com>
---

Please review and test if possible. Thanks.

Index: linux-2.6.git/arch/x86/kernel/smpboot.c
===================================================================
--- linux-2.6.git.orig/arch/x86/kernel/smpboot.c	2008-09-14 21:49:36.000000000 +0400
+++ linux-2.6.git/arch/x86/kernel/smpboot.c	2008-09-15 18:30:37.000000000 +0400
@@ -893,8 +893,10 @@ do_rest:
 		/*
 		 * Be paranoid about clearing APIC errors.
 	 	*/
-		apic_write(APIC_ESR, 0);
-		apic_read(APIC_ESR);
+		if (APIC_INTEGRATED(apic_version[phys_apicid])) {
+			apic_write(APIC_ESR, 0);
+			apic_read(APIC_ESR);
+		}
 	}
 
 	/*
--
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